If you look at the two files, you'll see that the main difference is in the paths to the rqeuired files (MX keeps third party stuff under a 'lib' directory), so whichever file you decide to use you should make sure the paths correspond to where the files actually are. Assuming you do the upgrade by replacing the contents of the MX lib/steelseries directory, you'll need to use the paths in the existing MX file. If you do end up using the file from the latest Steelseries distribution, it makes sense to rename it so MX treats it as its own.

At some point I'll update the files in the MX distribution to the latest Steelseries release.

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